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package slashpath
import "core:strings"
import "core:unicode/utf8"
Match_Error :: enum {
None,
Syntax_Error,
}
// match states whether "name" matches the shell pattern
// Pattern syntax is:
// pattern:
// {term}
// term:
// '*' matches any sequence of non-/ characters
// '?' matches any single non-/ character
// '[' ['^'] { character-range } ']'
// character classification (cannot be empty)
// c matches character c (c != '*', '?', '\\', '[')
// '\\' c matches character c
//
// character-range
// c matches character c (c != '\\', '-', ']')
// '\\' c matches character c
// lo '-' hi matches character c for lo <= c <= hi
//
// match requires that the pattern matches the entirety of the name, not just a substring
// The only possible error returned is .Syntax_Error
//
match :: proc(pattern, name: string) -> (matched: bool, err: Match_Error) {
pattern, name := pattern, name
pattern_loop: for len(pattern) > 0 {
star: bool
chunk: string
star, chunk, pattern = scan_chunk(pattern)
if star && chunk == "" {
return !strings.contains(name, "/"), .None
}
t: string
ok: bool
t, ok, err = match_chunk(chunk, name)
if ok && (len(t) == 0 || len(pattern) > 0) {
name = t
continue
}
if err != .None {
return
}
if star {
for i := 0; i < len(name) && name[i] != '/'; i += 1 {
t, ok, err = match_chunk(chunk, name[i+1:])
if ok {
if len(pattern) == 0 && len(t) > 0 {
continue
}
name = t
continue pattern_loop
}
if err != .None {
return
}
}
}
return false, .None
}
return len(name) == 0, .None
}
@(private="file")
scan_chunk :: proc(pattern: string) -> (star: bool, chunk, rest: string) {
pattern := pattern
for len(pattern) > 0 && pattern[0] == '*' {
pattern = pattern[1:]
star = true
}
in_range := false
i: int
scan_loop: for i = 0; i < len(pattern); i += 1 {
switch pattern[i] {
case '\\':
if i+1 < len(pattern) {
i += 1
}
case '[':
in_range = true
case ']':
in_range = false
case '*':
in_range or_break scan_loop
}
}
return star, pattern[:i], pattern[i:]
}
@(private="file")
match_chunk :: proc(chunk, s: string) -> (rest: string, ok: bool, err: Match_Error) {
chunk, s := chunk, s
for len(chunk) > 0 {
if len(s) == 0 {
return
}
switch chunk[0] {
case '[':
r, w := utf8.decode_rune_in_string(s)
s = s[w:]
chunk = chunk[1:]
is_negated := false
if len(chunk) > 0 && chunk[0] == '^' {
is_negated = true
chunk = chunk[1:]
}
match := false
range_count := 0
for {
if len(chunk) > 0 && chunk[0] == ']' && range_count > 0 {
chunk = chunk[1:]
break
}
lo, hi: rune
if lo, chunk, err = get_escape(chunk); err != .None {
return
}
hi = lo
if chunk[0] == '-' {
if hi, chunk, err = get_escape(chunk[1:]); err != .None {
return
}
}
if lo <= r && r <= hi {
match = true
}
range_count += 1
}
if match == is_negated {
return
}
case '?':
if s[0] == '/' {
return
}
_, w := utf8.decode_rune_in_string(s)
s = s[w:]
chunk = chunk[1:]
case '\\':
chunk = chunk[1:]
if len(chunk) == 0 {
err = .Syntax_Error
return
}
fallthrough
case:
if chunk[0] != s[0] {
return
}
s = s[1:]
chunk = chunk[1:]
}
}
return s, true, .None
}
@(private="file")
get_escape :: proc(chunk: string) -> (r: rune, next_chunk: string, err: Match_Error) {
if len(chunk) == 0 || chunk[0] == '-' || chunk[0] == ']' {
err = .Syntax_Error
return
}
chunk := chunk
if chunk[0] == '\\' {
chunk = chunk[1:]
if len(chunk) == 0 {
err = .Syntax_Error
return
}
}
w: int
r, w = utf8.decode_rune_in_string(chunk)
if r == utf8.RUNE_ERROR && w == 1 {
err = .Syntax_Error
}
next_chunk = chunk[w:]
if len(next_chunk) == 0 {
err = .Syntax_Error
}
return
}
|
